SOLUTION: I have in my pocket 25 coins made up of nickels and dimes. The total of these coins is $1.60. How many of each do I have?

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Question 1159407: I have in my pocket 25 coins made up of nickels and dimes. The total of these coins is $1.60. How many of
each do I have?

Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
.

Let the number of dimes be " d ".

Then the number of nickels is (25-d), correct ?


The money equation is 

    10d + 5*(25-d) = 160  cents,   correct ?


Simplify this equation step by step and find d.


    10d + 125 - 5d = 160

    5d             = 160 - 125 = 35

     d                         = 35/5 = 7.


ANSWER.  7 dimes and the rest coins, 25-7 = 18 are nickels.


CHECK.   7*10 + 18*5 = 70 + 90 = 160  cents.   ! Precisely correct !

The problem is just solved.

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For coin problems and their detailed solutions see the lessons in this site:
    - Coin problems
    - More Coin problems
    - Solving coin problems without using equations
    - Kevin and Randy Muise have a jar containing coins
    - Typical coin problems from the archive
    - Three methods for solving standard (typical) coin word problems
    - More complicated coin problems
    - Solving coin problems mentally by grouping without using equations
    - Non-typical coin problems
    - Santa Claus helps solving coin problem
    - OVERVIEW of lessons on coin word problems

You will find there the lessons for all levels - from introductory to advanced,
and for all methods used - from one equation to two equations and even without equations.

A convenient place to quickly observe these lessons from a  "bird flight height"  (a top view)  is the last lesson in the list.

Read them attentively and become an expert in this field.

Also,  you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic "Coin problems".


Save the link to this online textbook together with its description

Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson

to your archive and use it when it is needed.